Environmental Science: A Global Concern, 5th edition
Introducing students to environmental science without any prerequisites, this text has a strong global emphasis and recognizes that the world is a unified biosphere that doesn't adhere to artificial (political) boundaries. Topics covered include the Greenhouse Effect, the Clean Air Act and El Nino.
William P. Cunningham, Barbara Woodworth Saigo, and Barry W. Barker. 1999. Environmental Science: A Global Concern, 5th edition. , () . http://nsuworks.nova.edu/occ_facbooks/71.